"Jeff Wisnia" wrote in message
et...

I hear what you say about a spring, and it makes sense that there may be
one there. But it's interesting that the reference link you gave mentioned
"springs" when describing the first two meter types, but not the moving
iron one. Wonder why? Probably just an oversight.

Perhaps they felt it was redundant. It's like holding two magnets N to N and
S to S - you are the spring holding them together.